"The library 'hostpolicy.dll' required" if run from deploy folder, but emitEntryPoint is true

Question

I created a Web API project using the default ASP.NET Core Web Application (.NET Framework) template and then published to local folder using VS.

Now if I call dotnet application.exe in the console, I receive the following error:

A fatal error was encountered. The library 'hostpolicy.dll' required to execute the application was not found

I have found in this answer and this issue on github, that the actual problem is a missing emitEntryPoint property. All is fine, except that my project.json already has "emitEntryPoint": true

What else can cause this error?

Tachylyte

Does your application work in Visual Studio debug mode, before publishing? – Fruge

yes, and it works if use 'dotnet run' from project folder – Tachylyte

What happens if you run the published .exe, without using dotnet? – Fruge

hm, don't know why I haven't check this, cause it works fine. Thank you. – Tachylyte

No problem. Posted it as an answer in case anyone else runs into this! :) – Fruge

Answer 1

Once you publish the application and have a .exe file, you don't need to use dotnet anymore. The application is compiled!

Just run application.exe by double-clicking it, or launching it from the console.

Fruge

I can't get VS to generate exe even after I publish. Any ideas what could be wrong? – Ryeland

@Ryeland Sounds like your csproj file may not be correct. I'd recommend posting a new question with the contents of your csproj file. – Fruge

@Mayank, can you verify if the .Net core SDK version installed is same as the one specified in global.json file? – Loquacious

Answer 2

Make sure you install the correct version of ASP Net Core in the server.

Here is the download link:

https://dotnet.microsoft.com/download/dotnet-core

Adorable

Answer 3

We ran in the same problem building our app in CI. Apparantly a reference towards another unittest project slipped in. This Created the error at hand.

Stockholm